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topic 59774

What to do if AMS2759 heat treat cycle was interrupted



January 27, 2015

Q. During the first run to AMS2759, the furnace lost power after 5 hours of an 8-hour cycle. I'm reading the AMS and it doesn't clearly state what to do. Do I put it back in and restart the cycle? Do I have to plate it again?

Mike Chados
Engineer - Gainesville, Florida, USA


January 29, 2015

Hi Mike!

If you're referring to AMS2759/9 [affil. link to spec at Techstreet] baking after plating procedures, then when we've had power outages or other problems I look to the "Multistep Processes" wording in paragraph 3.3.3.6 for guidance. Certainly you still have to contact the customer/design authority for resolution, but the hardness and time working of those paragraphs give a strong indicator of the relative severity of the issue.

Good luck!

lee gearhart
Lee Gearhart
metallurgist - E. Aurora, New York


January 30, 2015

Q. Thanks for the input. We are manufacturing 440C parts and have been told to perform this operation as an output of passivation as we have been told passivation is a form of plating. What are your thoughts on this?

Mike Chados [returning]
- Gainesville, Florida


January 2015

A. Hi Mike. Passivation is not a form of plating. With regard to the possible hydrogen embrittlement caused by passivation, please see letter 58390, "Hydrogen embrittlement from passivation?"

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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